动阀套位移反馈比例方向阀的特性分析及试验研究

发布时间：2018-04-17 14:59

本文选题：比例方向阀 + 试验系统　；参考：《浙江大学》2013年硕士论文

【摘要】：比例阀是液压系统中极其重要的元件,它的特性直接关系到液压系统的品质。同时由于比例阀相对于伺服阀成本低、对油液污染不敏感等优点,在各领域都得到了广泛的应用。比例阀静态特性已经与伺服阀相当,动态响应较慢。对阀进行数学分析,可以为改进阀的参数提供理论支持；研制比例阀测试系统,不仅能对比例阀的动、静态特性进行检测,实现自动化、高精度测量,同时能直观看到阀改进后的试验效果。本文基于动阀套比例反馈比例方向阀的基本结构,建立了数学模型和相关仿真分析,同时研制了一套针对被试阀的测试系统。论文的主要内容如下：第一章,概述了比例方向阀的国内外发展现状,以及特点和分类。同时简单介绍了课题的研究背景及意义、主要研究意义及难点。第二章,简单介绍了本文研究阀的基本结构,针对阀的先导阀、主阀和节流阀,基于流量连续性方程和力的平衡方程建立了对应的数学模型。第三章,基于阀的数学模型,对相关公式进行拉氏变换,得到阀的传递函数,基于Simulink对阀的相关动态特性进行仿真。同时基于AMESim对阀进行静态特性仿真。针对阀在实际应用中的死区问题,提出了三种死区补偿策略。第四章,介绍了比例阀测试试验台的研制过程,包括液压系统设计,主要液压和电气元件的设计计算,下位机PLC和上位机LabVIEW软件的编写与通讯,测试系统软件功能和界面的简单介绍。第五章,针对被试阀的试验条件,提出了油温控制方案。为了保证测试过程中阀压差恒定,提出了分段PID控制策略。采用分段PID控制算法对阀压差进行控制,实验结果表明控制误差能达到试验标准的要求。根据试验条件和工况,分析了阀的相关静态特性试验结果。第六章,概括了全文的主要研究工作和成果,并展望了今后需进一步研究的工作和方向。
[Abstract]:Proportional valve is a very important component in hydraulic system. Its characteristic is directly related to the quality of hydraulic system.At the same time, proportional valve is widely used in various fields because of its low cost and insensitivity to oil pollution.The static characteristic of proportional valve is similar to that of servo valve, and the dynamic response is slow.The mathematical analysis of the valve can provide theoretical support for improving the parameters of the valve, and the development of the proportional valve test system can not only detect the dynamic and static characteristics of the proportional valve, but also realize the automatic and high precision measurement.At the same time, the test effect of the improved valve can be seen intuitively.Based on the basic structure of proportional feedback proportional directional valve with moving valve sleeve, the mathematical model and related simulation analysis are established in this paper, and a test system for the tested valve is developed at the same time.The main contents of the thesis are as follows:The first chapter summarizes the development of proportional directional valve at home and abroad, as well as the characteristics and classification.At the same time, the research background and significance, the main research significance and difficulties are briefly introduced.In the second chapter, the basic structure of the valve is briefly introduced, and the corresponding mathematical model is established for the pilot valve, main valve and throttle valve based on the flow continuity equation and the balance equation of force.In the third chapter, based on the mathematical model of the valve, the relevant formulas are transformed into Laplace transform, and the transfer function of the valve is obtained. The dynamic characteristics of the valve are simulated based on Simulink.At the same time, the static characteristics of the valve are simulated based on AMESim.In order to solve the dead zone problem in practical application, three dead-time compensation strategies are proposed.In the fourth chapter, the development process of proportional valve test bench is introduced, including hydraulic system design, design and calculation of main hydraulic and electrical components, compilation and communication of PLC and LabVIEW software.Brief introduction of the software function and interface of the test system.In the fifth chapter, according to the test conditions of the tested valve, the oil temperature control scheme is put forward.A piecewise PID control strategy is proposed to ensure the constant pressure difference of the valve during the testing process.The pressure difference of the valve is controlled by subsection PID control algorithm. The experimental results show that the control error can meet the requirements of the test standard.According to the test conditions and working conditions, the test results of the relevant static characteristics of the valve are analyzed.In chapter 6, the main research work and achievements are summarized, and the future work and direction are prospected.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH137.5

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